Chuck



Patented J 10, 1928:.

UNITED STATES- Inv-5,906l PATENT OFFICE.

EERBERTYE. KEMIETON, KEITH F. GALLIMORE, AND RAYMOND M. WOYTYCBI, OF FOND DU' LAC, WISCONSIN, ASSIGNORS, BY MESNE `ASSIGfNlllIElIilllS, T0 THE HEALD IIA- CHINE COMPANY, 'OF WORCESTER, MASSACHUSETTS, A CORPORATION OF MASSA- CEUSETTS.

snuck.

Applmmn mea .my 2, 1924. serial ne. 723,662.

Uur invention relates to improvements in chucks, and has particular references vto chucks of the collet type.

An im ortaut object of our invention 1s t to provi e a chuck in which the clamping means is pressed yieldinglyinto end and peripheral. engagement with the work.

Another object is to provide a chuck in which the. clamping means moves hrst to tti engage the end of the work, and then to engage the'periphery thereof.

A lurther object is to provide a chuck for internal grinders, in which a single clamping means is spring pressed lforwardly to lll center the work and to hold it securely in centered position.

Another obj ect is to provide a chuclr ol the above characterl which is simple and sturdy in construction, and in which the work can tu be duiclrly clamped in position and removed..

lurther objects and advantages will become apparent as the description proceeds.

ln the accompanying drawings, lligure 1 is a longitudinal sectional view talren in ttt lane ot e 1-1 ol liig. 2 ol a chuck emhodying the features ot our invention. Fig. 2 is a iront end view thereof.

lFig. 3 is a fragmentary sectional view ol p .a slihtly modied form. tu hl we have 4shown in the drawings,

and will herein describe in detail the prelerred embodiment of our'invention, it is to be un that we do. not thereby4 intend to limit the same to the constructt tion disclosed, but aim in the appended claims to cover 'all modications and alternative constructionsfalling within the spirit and scope of theinvention. f f

'Referring to the exemplary embodiment tu of our invention illustrated in the drawings,`

lll represents the body/of the chuck, and 11 indicates a rotatable ywork spindle having a flange 12 to which the body 1() Vis secured hy an, suitable means, such as cap screws am 13. he body in the present instance is cylindrical and hollow, the walls being formed with a plurality of spaced clearance oenings 14 through which refuse thrown o inthe machine operation, may be conw ducted away. A n annular late 15 fitting on the front-end of the spin e I1 is secured in an annular notch 16 in the rear end of the body 10.

-enga ed by At its front end, thebod 10 is provided with an axial bore 17, andI7 with a pair of oppositely positioned and forwardly extending arms 18. A face or iront plate 19 is secured to the front ends ofthe arms 18 by cap screws 20, and vis provided with a central opening 21 in which a hardened bushing 22 is mounted concentric withrespect to the axis of rotation.

Positioned inthe bore'l is a cylindrical bushing 23. An actuating Vmember 2li is located Iin the body 10 and is providedwith a forwardly extending sleeve 25 which is slidably mounted in the bore ll'. Clearance passages 26 in the .member 2t connect the interior olf the sleeve 25 with the clearance openings 1l. rlhe actuating member 24 is threaded onto the forward end of a draw bar 2l' extending through the spindle 1l linto the body 10, and is pressed t'orwardly by a plurality ot coiled springs 28. 'lhese springs abut at their rear ends against theV annular plate l5, and at their forward ends ht intespnced holes 29 drilled in the rear lace of the member 2li.

.Slidahly mounted in the sleeve 25 is a collet member 30 which is split at 31 to provide clamping jaws 32. 'llhe jaws 32 are provided with end and peripheral bearing surfaces 33 and 3l respectively, and with' wedge surfaces 35 positioned to be the `,inner rounded iront edge 36 o 'the sleeve 25. A pin 37 extends inwardly from the sleeve 25 into an annular groove in the-periphery oit collet member 30, thereby providing a lost motion connection to linut the independent relative movement of the latter. A notch 38a is provided inthe left hand wall of the groove '38 to permit ready assembly and disassembly oi the sleeve 25 and the member 301.

the modication shown in Fig. 3, an annular shield 39 having a rearwardly extending flanged() which fits into an annularA dll groove 41 between the body 10 and the bush- 111g 23 is secured to the front end of the sleeve 25 to prevent the entrance of abrasive articles to the bearing surfaces between theV ushing 23 and the sleeve 25. In other res ects the construction is the same as that s ownin Figs. 1 and 2.

While the chuck can be adapted to many derent kinds rof work, it is particularly Y adapted foruse in internal grinding machines, and we have therefore illustrated a blank A having a-bore which is to be ground by a suitable element 42. In loadingthc chuck, the draw bar 27 is released, thereby allowing the springs 28 to move the member 24 forwardly. The sleeve 25 moves the collet member 30 into end engagement with the blank A. The outwai'd pressure ot the spring jaws 32 is suiiicient to prevent Vthe pin 37 vfrom moving against the outer side wall of the groove 38 until the collet member 30 engages the end of the blank. Upon further movement of the sleeves 25, the edge 36 moves along the wedge surface 35 to spring the jaws 32 into peripheral engagement with the blank A. The jaws 32 thus serve to center the blank A quickly and accuratel in the chuck and also to clamp the blan securely in centered position.

We claim as our invention:

1. A chuck having, in combination, a hollow body provided with a plurality ot' radial clearance passages and an axial bore, for-- wardly extending arms formed on opposite sides of said body, a face plate secured to the outer ends of said arms, a bushing mounted in said plate in axial alinement with said bore, an actuating member slidably mounted in said bore, a collet jaw member slidably mounted in said actuating member, and having a lost motion connection therewith, a plurality of springs engaging said body and saidV actuating member to move the latter for wardly, and means for moving said actuating member rearwardly.

2. A chuck having, in combination, a body provided with a face plate, an axial bore formed in said body, an actuating member slidably mounted in said bore for move'- ment toward and from said face plate, a collet member slidably mounted in said actuating member, said collet member being provided with wedge means positioned to be engaged by said actuating member, means for providing 'a `,lost motion connection between said members, spring means for movling said actuating member forwardly, and

Y said body,

means for withdrawing, said actuating member. y

3. A chuck comprisin in combination, a hollow body, a face p ate secured lo the front of said body,`an axial bore in said body, a collet member slidably mounted within said bore, gan` actuating member mounted in said bod for moving said collet member toward an :from said face plate, spring means lfor moving said actuating member forwardly, and means for moving said actuating member rearwardly.

4. A chuck having, in combination, a body provided with a face plate, an axial bore in a sleeve mounted in sai-l bore, a collet member slidably mounted in said sleeve, means operatively connecting said 4and said clamping means sleeve and said member vt'or limited joint longitudinal movement, and spring means for moving said sleeve member forwardly to actuate said collet member.

5. A chuck having, in combination, a body shaped to receive a work blank, an axial bore in said body, an actuating member mounted in said bore, a collet. member slidably mounted in said actuating member and having jaws positioned to receive the inner end ol said work blank, means for moving said actuating member rearwardly, and yielding means for moving said actuating member forwardly, said' actuating member acting to move said jaws lirst against; the end ot said work blank, and then into peripheral engagement therewith.

6. A chuck having, in combination, a body, a sliding member mounted centrally in said body, a collet member mounted in said sliding member, a lost motion connection between said members, spring jaws on said collet member having wed e surfaces ositioned for engagement by t e forward e ge of said sliding member, and means for actuating said sliding member.

7. A chuck having, in combination, a body adapted to receive a work blank, a collet member centrally mounted in said body and having spring jaws to receive one end of said work blank, and a single spring pressed means for moving said collet member forwardly to bring said jaws into end engagementl with the work and then flexing said jaws into peripheral engagement with said work blank.

8. A chuck having, in combination, a body provided with a face plate and havin an axial bore, a movable member in said body, said member having a forwardly extending sleeve slidably mounted in said bore, clamping means mounted in said sleeve and adapted to clamp the means operatively connecting said member and permitting a limited relative sliding movement therebetween, and means for actuating said member to actuate said clamping means.

9. A chuck having, in combination, a body provided with a central bore, 'a movable member slidably mounted in said bore, a clalnping member slidably mounted in said movable member, a lost motion connection between said members, and a plurality of springs for moving said movable member forwardly.

10. A chuck having, in combination, a hollow body, forwardly extending arms formed on opposite sides of said body a face plate secured to the outer ends of sai arms, a bushing centrally mounted in said plate, a clamping member mounted in said body, a sleeve formed en said clamping member and slidably mounted in the front of said body, a collet member slidably mounted in said sleeve and having a lost motion connecwork against said plate,

Lernspa tion therewith, said collet member being provided with jaws having Wedge surfaces, means for moving said clamping member rearwardly, and spring means for moving said clamping member forwardly.

l1. A chuck having, ineombination, a

Yoody, a clamping surface, an actuating mem-' her slidably mounted in said. body, a clamping member slidably mounted in said actuends of said jaws projecting into Wedge engagement with the adj aeent end of said actuating. member, a lost motion connection between said members permitting a limited independent longitudinal movement therebetween, and means` for actuating said rst mentioned member.

In testimony whereof we have hereunto aliixedY our signatures.

ating member, said .clamping member having spring jaws adapted to engage oneend and the periphery ofthe Work to clamp the work centrally against said surface, the outer HERBERT E. KEMPTN. KEITH F. GALLDIORE. RAYMND M. WOYTYCH.- 

